_ead.html.erb

# only relevant pieces of this partial
<% content_for :sidebar do %>
<%= xslt 'catalog/_show_partials/_ead/show_sidebar.xsl', @document[:xml_display] %>

  <% if @document['subject'] %>
    <h4>Subjects</h4>
    <ul class="subjects">
      <%  @document['subject'].sort.each do |subject| %>
        <li>
          <%= link_to subject, catalog_index_path('f[subject_facet][]' => subject) %>
        </li>
      <% end %>
    </ul>
  <% end %>
<% end %>

<%= xslt('catalog/_show_partials/_ead/show.xsl', @document[:xml_display]) %>

application_helper.rb

# performs an XSLT transform given a path to a stylesheet and a document
  def xslt(stylesheet_file_path, document, params={})
    require 'nokogiri'
    document = Nokogiri::XML(document) 
    stylesheet_file = render(stylesheet_file_path)
    stylesheet = Nokogiri::XSLT(stylesheet_file)
    stylesheet.apply_to(Nokogiri::XML(document.to_xml), params)
  end

blacklight_config.rb

Blacklight.configure(:shared) do |config|
  
  SolrDocument.marc_source_field  = :marc_display
  SolrDocument.marc_format_type   = :marcxml
  SolrDocument.ead_source_field   = :xml_display

  # rest of the configuration

ead.rake

desc "index a directory of ead files"
    task :ead_dir=>:environment do
      input_file = ENV['FILE']
      if input_file =~ /\*/
        files = Dir[input_file].collect
      else
        files = [input_file]
      end
      files.each_with_index do |f,index|
        puts "indexing #{f}"
        ENV['FILE'] = f
        Rake::Task["solr:index:ead"].invoke
        Rake::Task["solr:index:ead"].reenable
      end
    end

    desc "Index an EAD file at FILE=<location-of-file>. expects a glob"
    task :ead=>:environment do
      require 'nokogiri'

      raw = File.read(fetch_env_file)
      # remove the default namespace,
      # otherwise every query needs a "default:" prefix,
      # and a namespace option must be set
      # NCSU is using Archivists' Toolkit to create and export EADs
      raw.gsub!(/xmlns=".*"/, '')

      xml = Nokogiri::XML(raw)

      # We want to indicate in the views whether there is 
      # associated digital content available for a faid
      dao_value = xml.xpath('//dao').empty? ? false : true

      #gather subject fields splitting on --
      subject_fields = ['corpname','famname','occupation','persname', 'subject']
      subject = subject_fields.map do |field|
        xml.xpath('/ead/archdesc/controlaccess/' + field).map do |field_value|
          field_value.text.split('--').map do |value|
            value.strip.sub(/\.$/, '')
          end
        end
      end

      solr_doc = {
        :format_code => 'ead',
        :type => 'Collection Guide',
        :format_facet => 'EAD',
        #:title_t => xml.at('//archdesc[@level="collection"]/did/unittitle').text,
        :title => xml.at('//eadheader/filedesc/titlestmt/titleproper').text,
        :institution_t => xml.at('//publicationstmt/publisher').text,
        #:language_facet => xml.at('//profiledesc/langusage/language').text.gsub(/\.$/, ''),
        :ead_filename_s => xml.at('//eadheader/eadid').text,
        :id => xml.at('/ead/eadheader/eadid').text.gsub(/\.xml/, ''),
        :xml_display => xml.to_xml,
        :text => xml.text,
        :dao_b => dao_value,
        :subject => subject.flatten.uniq
      }
      
      response = Blacklight.solr.add solr_doc
      require 'pp'; pp response
    end